Newbie DBMS_OUTPUT problem

Heres the problem:
I am writing this PL/SQL program that uses DBMS_OUTPUT.PUT_LINE to write a header line, some report lines within a cursor FOR loop, and a footer line e.g. DBMS_OUTPUT.PUT_LINE('End of Report');

I have a DBMS_OUTPUT.ENABLE statement right after the BEGIN statement, and a DBMS_OUTPUT.DISABLE call just before the final END; statement. The procedure compiles with no errors and all I get is the message 'Procedure created'.

Any suggestions? Thanks in advance for your help.  

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